Radial setting-gage for cutter-head knives.



No=846,728. 'PATENTED MAR.12,Y 1907. 0. W. H. BLOOD.

RADIAL SETTING GAGE FOR CUTTER HEAD KNIVES.

APPLICATION FILED APILZQ, 1906.

UNITED STATES PATENT OFFICE.

CHARLES w. H. BLOOD, or BoSTo iiAssACHUsETTs, ASSIGNOR To S. A. WOODS MACHINE COMPANY, or BOSTON, MASSACHUSETTS.

RADIAL SETTING-GAGE FOR CUTTER-HEAD KNIVES.

Specification of Letters Patent.

famenteq March 12, 1907.

Application filed April 28, 1906. Serial No.'314,149. V

Head Knives, of which the following description, in connection with the accompanying drawmgs, 1S a Specification, like letters on the drawings representing like parts.

The usual way of ad usting cutter-head knives at present is to adjust them out wardly on the head until they meet the gage. Extreme accuracy of machining of the head has heretofore been necessary, and it has also been necessary to have the cutting edges of.

the knives all in the same relative position with regard to the body of the blade, while various other niceties of construction have been required in order to obtain proper adjustment of the cutting edges of the various blades to the same radial distance from the center of the journal. Inasmuch as the quality of the work depends largely upon the accuracy of the adjustment of the cutterhead knives it is obvious that this adjustment must be as nearly perfect as possible.

Accordingly my present invention has for its object the provision of means for quickly and accurately adjusting the knives to the same radial distance from the center of the journal irrespective of the accuracy of the faces of the cutter-head and of the position which the edges of the knives occupy with relation to the body of the knives.

In accomplishing my object I provide a centering device which can readily change its position on the journal without'varying the radial distance of its adjustment and which accomplishes the desired adjustment by forcing the knives backward, being in this respect directly opposite to the previous method above alluded to. I

The constructional details of my invention will be pointed out in the course of the following description, reference being had to the accompanying drawings, in which I have shown a preferred embodiment of the invention.

In the drawings, Figure l is a view in end elevation of a cutter-head showing my setting-gage applied thereto, the ournal being shown in section. Fig. 2 is a top plan view thereof. Fig. 3 is a fragmentary detail in elevation.

For convenience of illustration I have Shown my device in operative position on a usual cutter-head 1 and journal 2, said cutter-head being provided with knives 3, secured in usual manner by nuts 4 and T-bolts 5, sliding in grooves 6 for retaining said knives on the flat sides or faces 7 of the head 1, their adjustment being permitted by usual slots 8.

Stated in general terms, my invention resides in providing a knife-edge-engaging device capable of swinging past the edges of the knives in the path of a true circle about the center of the cutter-head journal, the knives being set out slightly beyond their ultimate position and held loosely, so that when said swinging device engages their cutting edges they are instantly crowded back into accurate alinement.

Referring to the drawings it will be seen that l have provided opposite arms 9, provided with three bearing-surfaces 10, 11, 12, for engaging the journal 2 at separate points, and thereby instantly bringing the two arms into self-centered position. These arms extend out tangentially to the surface of the journal and carry a stiff rod 18 at their free ends, on which are mounted, as herein shown, two movable'devices 14, having an arc Surface concentric to the rod 13, said surface being of suflicient length for the purpose presently to be explained, and preferably having the form of a complete roll or wheel. The

point 10, as herein shown, is provided by free end of a downwardly-extending spring member mounted on a pivot 17 in a slot 18 of the arm 9, and thence extending outwardly at 1.9 to be engaged conveniently by the thumb of the operator and depressed against the slanting upper side of a lip 20 of an ear 21 (see Fig. 3) to be caught beneath said lip for lockin g the holding-arm 9 in swinging position on the journal.

From the above description it will readily be seen that the application and use of my invention is exceedingly convenient and quick. The operator simply grasps in his hands the opposite ends of the tool or attachment and releases the spring ends 19 from their locked position, so as to permit the hook shaped or curved endsof the arms to be caught over the journal at the opposite ends of the cutter-head. He then simply drops the contact-points 10 and 11 against the journal and depresses the locking-springs into their locked position, as shown in the drawings, accomplishing said locking by a simple movement of the thumb. As the locking device is more or less yielding, it

serves to hold the setting-gage inaccurate position, serving to constantly pull the points 10 and 11 tightly against the journal-surface,

thereby maintaining the edge-engaging-arc's or rolls 14 at an unvarying radial distance from the center of the journal. The gagesetter is then swung downwardly, the shaft The rolls 14 may be slid along on the shaft 13.

for different widths of knives or to test the accuracy of grinding of any knife. By having the engaging device 14 (or whatever other form of engaging device may be employed within the spirit and scope of the broader of my claims, hereinafter contained,) provided with. means compelling it to swing about the journal of the cutter it becomes immaterial whether the edges of the knives are in exactly the same place relatively to the bodies of the blades or not inasmuch as the engaging device comes in contact with the edges with reference to the center of the journal and not with reference to the surface 7 or any other portion of the head. Heretofore in this kind of cutter-head it has been usually considered necessary to have the cutting edge in the same plane as the surface 7, so that all the knives should be adjusted the same; but my invention makes it as readily practicable to set all the knives to the same gage even though the cutting edges are located in different relative planes in the different blades. I have shown the knives as beveled at both sides of the cutting edge, and my setting-gage will force all the cutting edges of this kind of blades into absolutely correct and uniform alinement as readily as it will any other location of cutting edge; also, by having the engaging device mounted to move concentrically of the journal it becomes a matter of indifference whether all the surfaces 7 of the cutter-head are machined unicomes into pressing contact with the edge.

By having the engaging surface arc-shaped itis'unnecessary always to have the same portion Of'SftlCl device engage the knife-edge; also, the ad ustment Wlll be correct even though the operator should be careless in quickly forcing the settingage downwardly over the knife-edge, whlch would not be true of a tangentlal surface. In some classes of work and for some purposesit is desirable to 4 have different are surfacest'. a, to have said surfaces at different radial distances from the shaft 13, as indicated at 22 23, Fig. ];whereby the operator may quickly bring any one of the are surfaces into engagement with a given knife-edge, and thereby corre- I spondingly adjust the knife. This is a quick means of bringing the knives to different standards of adjustment, and the micrometerscrew 15 is an accurate means of changing the adjustment to any given extent required. For extreme variations of size of journal I provide means for adjusting the lockingspring, herein shown for convenience as holes 24, for receiving the pin 17. I prefer to use the three-point bearing 10 11 12 because of the facility and quickness which it affords for accurately centering the device for the given radial distance from the center of the journal; also, the spring locking device is of advantage as it brings enough frictional drag on the journal to maintain the settinggage in position wherever it is placed. This is a great convenience to the operator.

It will be understood that a wide variety of equivalent mechanical embodiments may be resorted to flor accomplishing the results which I have explained above without departing from the spirit and scope of my invention, which I consider as broadly new in a number of respects aside from the structural details.

Having described my invention, what I claim. as new, and desire to secure by Letters Patent, is

1. A setting-gage for cutter-head knives, comprising swinging holding means for positioning the gage, and a rotary engaging device mounted to turn by engagement with the edge of the knife and to swing with said holding means.

2. A setting-gage for cutter-head knives,

formly and accurately as the gaging of the comprising movable holding means for posiknife-edges does not depend in any way upon ltioning the gage, and an engaging device to s rawsv I force the knife backwardly into accurate ad justment, movable automatically with rela-i tion to the holding meansuponcoming in contact with the edge of the knife;

3. A setting-gage for CUtiZGI'dlGQKhlUllVfiS, comprising holdmg means for positlonmg the gage, and an edge-engaging device oarrie d by said means and movable past theedge of the,

knife, said device having an arc surface mounted to swing concentrically of said are.

4. A setting-gage for cutter-head kmves,

comprising holding means for movahly engaging one side of the ournal of'the cutterhead, and edge-engaging means carried by said holding means at theopposite side of cluding a drag for yieldingly holding the gage in position, and edge-engaging means carried by said holding means for moving therewith at a fixed radial distance from the axis of the cutter-head. i

6. A settinggage for cutter-head knives,

gaging the journal of the cutter-head} including a spring locking device for releasing i said holding means from the journal, and

edge-engaging means carried by said holding means for moving therewith at a fixed radial distance from the axis of the cutter-head.

7. A setting-gage for cutter-head knives, comprising holding means for movatly engaging the journal of the cutter head, said holding means engagingthe journal circum ferential'ly at three bearing-points separated by lntervening gaps for accommodating said holding means to varying sizes ofjournals,

and edge-engaging means carried by said holding means for moving therewith at a fixed radial distance from the axis of the cut:

ter-head.

8, A setting-gage for cutter-head knives, comprising holding means for movablyfeng gaging the journal of the cuttor-headfsaid holding means having at least three indee pendent bearing-points, one of said }points, being adjustable and normally rigid, and edge-engaging means carried by said, holding means for moving therewith at a fixed radial distance from the axis of the cutter-head;

9. A setting-gage for cutter-head knivesg comprising holding means forrmovably engaging the journal of the cutter-head, said cutter-head.

10. A setting-gage for cutter-head knives, comprising an arm provided with means for jing the journal Fof the cutter-head, and havremovablyeinbracingthe journal of the cutter-head, alateralshaft extendingfrom the fr ce end of said armfparallel to the journalaxis, andan engaging device on said lateral shaft having" an are surface to engage the edge of a knife to beset. j 11; Asetting-gage for cutter-head knives,

. comprising an arm provided with means for 1 removablyembracing the journal of the cut- ;ter-head,,lateral shaft extending from the free*end;ofsaid 'arm parallel to the journal- 1 axisfandan arceshaped engaging device slidmg onsaid shaftfor engaging the edge of a knife tobe set. j "15g 12. A setting-gage for cutter-head knives, comprising opposite holding-arms provided at oneend with means for partially embrac- 'ing the journal of the cutte'r head, and hav [ing meansfor yieldingly'engaging said journal opposite said embracing means for holdingthe latter in constant contact with the journal, a shaft extending laterally from one arm to the other at a given radial distance from saidjournal, said shaft being provided with an arc-shaped surface forengaging the g g cutting edge of a blade to be set. comprising holding means for movably en' 13. 1A setting-gagefor cutter-head knives,

atone end with means for partially embrac from said journal, said shaftbeing provided withfan arc-shaped surface for engaging the 0 means foryieldingly engaging said jour nailropposite said embracing means for holding the latter in constant contact with the journal, a shaft extending laterally from one arm to the other at agiven radial distance ioo cuttingedge of a bladetobe set, said yield- 7 ing means having a projecting portion extendingexternally of said arm in position to be engaged by the operator for releasing said yielding meansfroin engagement With the j ournal. J

at one end with means for partially embracing'the journal: of the cutter-head, and having means for yieldingly engaging said j ournal opposite said embracing means for holding the'l'atter in constant contact with the journal,- a shaft extending laterally from one armtothefotherat a given radial distance ,Witlranarc-shaped surface for engaging the from said journal, said sha'ft being provided other endprojecting outwardly in position to be engaged by the operator, said arm having means for removably restrainingsaid proect1ngend.-

M J15QA'setting gage for cutter-head knives, comprising opposite holding-arms for partially spanning and engaging the journal of 141.] setting-gagefor cutter-head knives,

comprising oppositeholding-arms provided no toward and from each other on said shaft, for

simultaneouslyengaging the edge of a knife adjacent its opposite ends and forcing said knife back into gaged position.

16. A setting-gage for cutter-head knives, comprising opposite iholding-arms for partially spanning and engaging the journal of the cutter-head, a lateral shaft connecting the free ends of said arms, and an engaging device pivotally mounted on said shaft and having a stepped peripheral surface in arcs of different radial distances from its pivotal I 5 center, for engaging the cutting edge of a knife to be set.

' In testimony whereof I have signed my name to this specification in the presence of two subscrlblng Witnesses. 

